Method of removing dry paper trim



Nov. 10, 1953 H. IVER DOOT, JR 2,658,427

METHOD OF REMOVING DRY PAPER TRIM Filed Aug; 18, 1949 INVENTOR.

Patented Nov. 10, 1953 UNITED STATES PATENT OFFICE METHOD OF REMOVING -D'ltY'P-APER TRIM Henry Ver Doot, Jr., Green Bay, Wis,, assignor to F H w r P per pany, Gr en Bay, Wis,v a corporation of Wisconsin Application August 18, 1949, Serial No. 111,040

4 Cl ims- 1 This invention relates. to improvements in trim controllers.

In the manufacture of paper it is common practice to trim the edge of the web of paper just before the web leaves the forming wire. The trimmed off portion, which is in the form of a narrow continuous strip, then travels with the main portion of the web through the felts and around the Yankee drier roll. The main portion of the web leaves the drier roll for further processing, but the strip of trim adheres to the rotating drier roll and follows it around to a point where a doctor blade scrapes said strip from the drier roll.

Difliculty has heretofore been encountered because of the trim from certain light weight paper webs, such as tissue. As the narrow strip of trim is scraped from the drier roll by the doctor blade, it is acted upon by the air currents which are created by the adjacent rotating rollers and other equipment, and frequently becomes entangled with the finished and trimmed web. This may result in a break in the web which, of course, is very undesirable. In addition, static electricity may cause the strip of trim to be drawn to adjacent objects which have an pp i e charge. hus rendering the movement of the strip of trim unpredictable and troublesome.

With the above in mind, it is a general object of the invention to provide means for controlling the movement of a strip of thin paper trim while said strip is being scraped from a rotating roller.

A further object of the invention is to provide a trim controller which neutralizes any static electricity which may be present in the trimmed 01f strip.

A more specific object of the invention is to provide a trim controller of the class described wherein a fine stream of liquid such as water is directed onto the trimmed off paper strip, thereby weighting said strip so that as it leaves the drier roll it is unaffected by air currents and also thereby neutralizing any static electrical charge which may be present.

A further object of the invention is to provide a trim controller of the class described which is simple in construction, efficient in operation, and well adapted for the purpose described.

With the above and other objects in view, the invention consists of the improved trim controller and all of its parts and combinations, as set forth in the claims, and all equivalents thereof.

In the drawing accompanying and forming a part of this specification, wherein is shown one complete embodiment of the preferred form of the invention, and wherein the same reference characters indicate the same parts in both of th VlfiWSi Fig. l is a diagrammatic side view illustrating the travel of a paper web from a Fourdrinier mach n ver the felts and v r a dri r ro l, and also illustrating the improved trim controller associa d w h the dri r roll; and

Fig, 2 is an enlarged fragmentary persp ctive view showing a trimmed paper web passing over a drier roll, the improved trim controller being shown associated with said drier roll.

Referring more particularly to Fig. 1 of th drawing, which illustrates an important use for the present invention. the numeral 5 indi-' cates a sheet or web of paper which is formed on a Fourdrinier machine 4 having an endless forming wire 6 extending around a lower couch roll 1. The web 5 travels in the direction indicated in the drawing. Mounted above the forming wire 6 at the discharge end of the Four drinier machine 4 is a nozzle I4 which directs a stream of water under pressure at the web 5. The nozzle I4 is positioned adjacent an edge of the web 5 and separates therefrom an edge p rtion in the form of a continuous strip I6. This operation is known as trimmin and it insure a smooth straight edge I5, (see Fig. 2.) on the finished web.

An pper couch roll it carries an endless upper felt 9 and coacts with the lower couch roll I. The upper felt 9 extends around a plurality of rollers, as shown. The sheet of paper and the strip of trim I6 adhere to the upper felt 9 upon passing between the upper and lower couch rolls. An endless lower felt IIl extends around a plurality of rollers, as shown, and the paper web 5 and strip of trim I6 are squeezed between the upper and lower felts as said felts travel between a pair of rollers such as those shown at I I. The paper web 5 and strip of trim I6 continue to adhere to the upper felt until they come in contact with the yankee drier roll I2, said web and trim then traveling upwardly around said drier roll as shown, the web eventually leaving the opposite side of the drum I2, and passing under a roll I3 from which it moves on to the winding or the creping operations.

As the main portion of the web 5 leaves the drier roll I2 and travels beneath the roll I3, the narrow strip of trim I5 adheres to the drier r011 I2. In order to remove this trim, a doctor blade I1 is usually employed, which blade acts to scrape the strip I6 from the roll.

The equipment thus far described its conventional, and it is intended that the strip I6, as it leaves the doctor blade I1, drop downwardly onto the floor or into any suitable receptacle so that it may be collected. In practice, however, when manufacturing light paper such as tissue, air currents and static electricity cause unpredictable movement of the trim and the strip I6 sometimes becomes entangled with the main web 5. This may cause a break in the web and result in loss of time and paper before the web can again be properly threaded through its rollers.

To remedy this situation according to the principles of the present invention, a squirt nozzle I 8, which may be connected to a suitable source of liquid, such as water under pressure entering through a valve I9 and conduit 20, is mounted adjacent the doctor blade I1. The nozzle I3 is similar to the nozzle I4 and is positioned and adjusted to direct a fine stream of Water 2| at the strip of trim I6 preferably as the trim leaves the drier roll I2. The stream 20 serves to Wet the strip I6 and make it sufficiently heavy so that it falls vertically downwardly from the doctor blade I! and so that it is substantially unaffected by any air currents in the vicinity. In addition, the Water from the stream 2| neutralizes any static electrical charge which may be present.

By eliminating the susceptibility of the strip I5 to the influence of air currents and electrostatical charges, said strip leaves the doctor blade in an orderly manner and its movement is at all times under control. The danger of breaks in the main web is greatly reduced and the trimmed ofi strip I6 is easily collected for reclamation purposes. While it is preferable to have the stream 2i directed at the strip I6 as the strip I6 leaves the drier roll, it is obvious that the improved controller will operate satisfactorily if the stream 2! is directed at the strip I6 either while said strip is still on the drier roll or shortly after it has left the doctor blade.

While the invention has its greatest utility when used in paper manufacture at the location illustrated, it is applicable in any paper handling or manufacturing equipment where the control of trim is necessary or desirable.

Various changes and modifications may be made without departing from the spirit of the invention and all of such changes are contemplated as may come Within the scope of the claims.

What I claim is:

1. The method of controlling the movement of a strip of dry tissue paper trim which is being scraped from a rotating roll, comprising wetting said dry strip of trim at approximately the point where it is being scraped from the roll to increase the weight of the trim and neutralize any static electrical charge therein.

2. The method of controlling the movement of a strip of dry tissue paper trim which is being scraped from a rotating roll comprising squirting liquid on said dry strip at approximately the point where it is being scraped from the roll to increase the weight of the trim and neutralize any electrical charge therein.

3. The method of controlling the movement of a strip of dry tissue paper trim which is being scraped from a drier roll following the manufacture of tissue paper comprising squirting liquid on said dry strip at approximately the point where it is being scraped from the roll to increase the weight of the trim and neutralize any static electrical charge therein, and thereby prevent entanglement of the strip with the main web of tissue paper.

4. The method of controlling the movement of a strip of dry paper trim which is being scraped from a drier roll following the manufacture of paper comprising jetting liquid on said dry strip at approximately the point Where it is being scraped from the roll to increase the Weight of the trim and neutralize any static electrical charge therein, and thereby prevent entanglement of the strip with the main web of paper.

HENRY VER DOOT, JR.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 16,430 Blake Jan. 20, 1857 1,369,124 Pope Feb. 22, 1921 1,770,589 Cram July 15, 1930 1,945,118 McVicker et a1. Jan. 30, 1934 1,949,188 Smith Feb. 27, 1934 1,960,106 Grewin May 22, 1934 FOREIGN PATENTS Number Country Date 66,509 Austria Sept. 10, 1914 57,685 Sweden Nov. 13, 1919 629,349 Germany Apr. 28, 1936 

